2155308389 has 4 divisors (see below), whose sum is σ = 2321101356. Its totient is φ = 1989515424.

The previous prime is 2155308373. The next prime is 2155308439. The reversal of 2155308389 is 9838035512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89151364 + 2066157025 = 9442^2 + 45455^2 .

It is not a de Polignac number, because 2155308389 - 2⁴ = 2155308373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155308319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82896464 + ... + 82896489.

It is an arithmetic number, because the mean of its divisors is an integer number (580275339).

Almost surely, 2^2155308389 is an apocalyptic number.

It is an amenable number.

2155308389 is a deficient number, since it is larger than the sum of its proper divisors (165792967).

2155308389 is a wasteful number, since it uses less digits than its factorization.

2155308389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165792966.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 2155308389 is about 46425.2990189616. The cubic root of 2155308389 is about 1291.7242310098.

The spelling of 2155308389 in words is "two billion, one hundred fifty-five million, three hundred eight thousand, three hundred eighty-nine".